IF YOU USE WHATSAPP, YOU SHOULD DOWNLOAD THIS APP

If you have ever had to chat with multiple persons at time you would find that switching between chats can be a pain and that's where this nifty app Chat Helper comes handy.

It places a small WhatsApp widget at the side of the screen, which shows the number of open chats you've got.

Tapping on the widget either switches chats or shows you a list of active chats depending on the number.
The app requires accessibility and widget permission to run, the app prompt you to do it at first run.